Mobile phoneFrom Wikipedia, the free encyclopedia"Cell Phone" redirects here. For the film, see Cell Phone (film)."Handphone" redirects here. For the film, see Handphone (film).

Motorola L7 mobile phoneA mobile phone, cell phone or hand phone is an electronic device used to make mobile telephone calls across a wide geographic area, served by many public cells, allowing the user to be mobile. By contrast, a cordless telephone is used only within the range of a single, private base station, for example within a home or an office.A mobile phone can make and receive telephone calls to and from the public telephone network which includes other mobiles and fixed-line phones across the world. It does this by connecting to a cellular network provided by a mobile network operator.In addition to telephony, modern mobile phones also support a wide variety of other services such as text messaging, MMS, email, Internet access, short-range wireless communications (infrared, Bluetooth), business applications, gaming and photography. Mobile phones that offer these more general computing capabilities are referred to as smartphones.The first hand-held mobile phone was demonstrated by Dr Martin Cooper of Motorola in 1973, using a handset weighing 2kg.[1] In 1983, the DynaTAC 8000x was the first to be commercially available. In the twenty years from 1990 to 2010, worldwide mobile phone subscriptions grew from 12.4 million to over 4.6 billion, penetrating the developing economies and reaching the bottom of the economic pyramid.[2][3]Contents[hide] 1 History 2 Features 2.1 Software and applications 2.2 Power supply 2.2.1 Development and adoption of a common charger solution 2.2.1.1 Common power supply standard in the European Union 2.2.1.2 Common power supply standard in the People's Republic of China 2.2.1.3 Common power supply standard in South Korea 2.3 SIM card 2.4 Display 2.5 Central processing unit 3 Mobile phones in society 3.1 Market share 3.2 Media 3.3 Privacy 4 Usage 4.1 Examples 4.2 Sharing 5 Restrictions 5.1 While driving 5.2 In schools 5.3 Privacy 6 Health effects 7 Future evolution: Broadband Fourth generation (4G) 8 Comparison to similar systems 8.1 Alternate Names for mobile phones 9 See also 10 References 11 Further reading 12 External links

HistoryMain article: History of mobile phones

An evolution of mobile phonesRadiophones have a long and varied history going back to Reginald Fessenden's invention and shore-to-ship demonstration of radio telephony, through the Second World War with military use of radio telephony links and civil services in the 1950s.The first mobile telephone call made from a car occurred in St. Louis, Missouri, USA on June 17, 1946, using the Bell System's Mobile Telephone Service, but the system was impractical from what is considered a portable handset today. The equipment weighed 80 pounds (36kg), and the AT&T service, basically a massive party line, cost US$30 per month (equal to $337.33 today) plus 3040 cents per local call, equal to $3.37 to $4.5 today.[4]In 1956, the worlds first partly automatic car phone system, Mobile System A (MTA), was launched in Sweden. MTA phones were composed of vacuum tubes and relays, and had a weight of 40kg. In 1962, a more modern version called Mobile System B (MTB) was launched, which was a push-button telephone, and which used transistors to enhance the telephones calling capacity and improve its operational reliability, thereby reducing the weight of the apparatus to 10kg. In 1971, the MTD version was launched, opening for several different brands of equipment and gaining commercial success.[5][6]

Early phones were not mobileMartin Cooper, a Motorola researcher and executive is considered to be the inventor of the first practical mobile phone for handheld use in a non-vehicle setting, after a long race against Bell Labs for the first portable mobile phone. Using a modern, if somewhat heavy portable handset, Cooper made the first call on a handheld mobile phone on April 3, 1973 to his rival, Dr. Joel S. Engel of Bell Labs.[7]The first commercially automated cellular network (the 1G) was launched in Japan by NTT in 1979, initially in the metropolitan area of Tokyo. Within five years, the NTT network had been expanded to cover the whole population of Japan and became the first nationwide 1G network. In 1981, this was followed by the simultaneous launch of the Nordic Mobile Telephone (NMT) system in Denmark, Finland, Norway and Sweden.[8] NMT was the first mobile phone network featuring international roaming. The first 1G network launched in the USA was Chicago-based Ameritech in 1983 using the Motorola DynaTAC mobile phone. Several countries then followed in the early-to-mid 1980s including the UK, Mexico and Canada.The first "modern" network technology on digital 2G (second generation) cellular technology was launched by Radiolinja (now part of Elisa Group) in 1991 in Finland on the GSM standard, which also marked the introduction of competition in mobile telecoms when Radiolinja challenged incumbent Telecom Finland (now part of TeliaSonera) who ran a 1G NMT network.In 2001, the first commercial launch of 3G (Third Generation) was again in Japan by NTT DoCoMo on the WCDMA standard.[9]One of the newest 3G technologies to be implemented is High-Speed Downlink Packet Access (HSDPA). It is an enhanced 3G (third generation) mobile telephony communications protocol in the high-speed packet access (HSPA) family, also coined 3.5G, 3G+ or turbo 3G, which allows networks based on Universal Mobile Telecommunications System (UMTS) to have higher data transfer speeds and capacity.FeaturesMain articles: Mobile phone features and Smartphone

A printed circuit board inside a Nokia 3210All mobile phones have a number of features in common, but manufacturers also try to differentiate their own products by implementing additional functions to make them more attractive to consumers. This has led to great innovation in mobile phone development over the past 20 years.The common components found on all phones are: A battery, typically rechargeable, providing the power source for the phone functions An input mechanism to allow the user to interact with the phone. The most common input mechanism is a keypad, but touch screens are also found in some high-end smartphones. Basic mobile phone services to allow users to make calls and send text messages. All GSM phones use a SIM card to allow an account to be swapped among devices. Some CDMA devices also have a similar card called a R-UIM. Individual GSM, WCDMA, iDEN and some satellite phone devices are uniquely identified by an International Mobile Equipment Identity (IMEI) number.Low-end mobile phones are often referred to as feature phones, and offer basic telephony, as well as functions such as playing music and taking photos, and sometimes simple applications based on generic managed platforms such as Java ME or BREW. Handsets with more advanced computing ability through the use of native software applications became known as smartphones. The first smartphone was the Nokia 9000 Communicator in 1996 which added PDA functionality to the basic mobile phone at the time. As miniaturization and increased processing power of microchips has enabled ever more features to be added to phones, the concept of the smartphone has evolved, and what was a high-end smartphone five years ago, is a standard phone today.Several phone series have been introduced to address a given market segment, such as the RIM BlackBerry focusing on enterprise/corporate customer email needs; the SonyEricsson Walkman series of musicphones and Cybershot series of cameraphones; the Nokia Nseries of multimedia phones, the Palm Pre the HTC Dream and the Apple iPhone.Other features that may be found on mobile phones include GPS navigation, music (MP3) and video (MP4) playback, RDS radio receiver, alarms, memo recording, personal digital assistant functions, ability to watch streaming video, video download, video calling, built-in cameras (1.0+ Mpx) and camcorders (video recording), with autofocus and flash, ringtones, games, PTT, memory card reader (SD), USB (2.0), dual line support, infrared, Bluetooth (2.0) and WiFi connectivity, instant messaging, Internet e-mail and browsing and serving as a wireless modem. Nokia and the University of Cambridge demonstrated a bendable cell phone called the Morph.[10] Some phones can make mobile payments via direct mobile billing schemes or through contactless payments if the phone and point of sale support Near Field Communication (NFC).[11] Some of the largest mobile phone manufacturers and network providers along with many retail merchants support, or plan to support, contactless payments through NFC-equipped mobile phones.[12][13][14]Some phones have an electromechanical transducer on the back which changes the electrical voice signal into mechanical vibrations. The vibrations flow through the cheek bones or forehead allowing the user to hear the conversation. This is useful in the noisy situations or if the user is hard of hearing. [15]Software and applications

A Toshiba TG01 phone with touchscreen featureSee also: Mobile Industry Processor InterfaceThe most commonly used data application on mobile phones is SMS text messaging. The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993.Other non-SMS data services used on mobile phones include mobile music, downloadable logos and pictures, gaming, gambling, adult entertainment and advertising. The first downloadable mobile content was sold to a mobile phone in Finland in 1998, when Radiolinja (now Elisa) introduced the downloadable ringtone service. In 1999, Japanese mobile operator NTT DoCoMo introduced its mobile Internet service, i-Mode, which today is the world's largest mobile Internet service.The first mobile news service, delivered via SMS, was launched in Finland in 2000. Mobile news services are expanding with many organizations providing "on-demand" news services by SMS. Some also provide "instant" news pushed out by SMS.Mobile payments were first trialled in Finland in 1998 when two Coca-Cola vending machines in Espoo were enabled to work with SMS payments. Eventually, the idea spread and in 1999 the Philippines launched the first commercial mobile payments systems, on the mobile operators Globe and Smart. Today, mobile payments ranging from mobile banking to mobile credit cards to mobile commerce are very widely used in Asia and Africa, and in selected European markets.Power supply

Mobile phone charging service in UgandaMobile phones generally obtain power from rechargeable batteries. There are a variety of ways used to charge cell phones, including USB, portable batteries, mains power (using an AC adapter), cigarette lighters (using an adapter), or a dynamo. In 2009, the first wireless charger was released for consumer use.[16]Development and adoption of a common charger solutionOn 17 February 2009, the GSM Association (GSMA), together with 17 mobile phone manufacturers and providers, announced[17] their commitment to implementing a cross-industry standard for a universal charging solution for new mobile phones. The standard charger connector to be adopted by manufacturers in the Open Mobile Terminal Platform (OMTP) including Nokia, Motorola and Samsung is the micro-USB connector (several media reports erroneously reported this as the mini-USB). The new chargers will also be much more energy efficient than existing chargers. Having a standard charger for all phones means that manufacturers will no longer have to supply a charger with every new phone. The OMTP technical requirements describe a common charger with a standard USB-A receptacle and a detachable USB-A to microUSB-B cable.[18][19]In October 2009, the International Telecommunication Union (ITU) announced that it had also embraced the Universal Charging Solution standard based on the OMTP specifications promoted by the GSMA as its "energy-efficient one-charger-fits-all new mobile phone solution," and added: "Based on the Micro-USB interface, UCS chargers will also include a 4-star or higher efficiency rating up to three times more energy-efficient than an unrated charger."[20]Common power supply standard in the European UnionMain article: common External Power SupplyIn 2009, many mobile phone manufacturers signed a Memorandum of Understanding (MoU), agreeing to make most new data-enabled cell phones marketed in the EU compatible with a common External Power Supply (EPS). All signatories agreed to develop a common specification for the charger "to allow for full compatibility and safety of chargers and mobile phones."[21][22] The technical specifications for the common EPS were published in December 2010 as EN 62684:2010, Interoperability specifications of common external power supply (EPS) for use with data-enabled mobile telephones."[23] The mobile phone manufacturers who have agreed to this standard include the original signatories Apple, LG, Motorola, NEC, Nokia, Qualcomm, RIM, Samsung, Sony Ericsson, and Texas Instruments as well as Atmel, Emblaze Mobile, Huawei Technologies and TCT Mobile (Alcatel).[24] The Memorandum of Understanding also provides for the use of the common External Power Supply with compliant phones not equipped with a MicroUSB receptacle: "4.2.1...if a manufacturer makes available an Adaptor from the Micro-USB connector of a Common EPS [External Power Supply] to a specific non-Micro-USB socket in the Mobile Phone, it shall constitute compliance to this article."Common power supply standard in the People's Republic of ChinaIn 2006, the People's Republic of China issued a standard for mobile device power supplies (based on a 5V Power Supply with a USB-A receptacle and a detachable cable). The 2006 regulation is flexible regarding the interface on the mobile phone itself, allowing for the use of adapter cables if the mobile device is not equipped with a standard USB connector.[25] The standard was revised in December, 2009 (CCSA YD/T 15912006 updated to YD/T 15912009).Common power supply standard in South KoreaIn 2001, the South Korean Telecommunications Technology Association (TTA) released a "Standard on I/O Connection Interface of Digital Cellular Phone" TTAS.KO-06.0028.[26] The main feature of the standard is the specification of a 24 pin connector / socket for mobile phones sold in Korea. The 24 pin connector handles power input (battery charging) and power output, as well as data communication (USB and other digital signals), analog audio inputs and outputs (for hands-free microphone, earphone) and other signals. The 2007 revision of the standard (TTAS.KO-06.0028/R4) specifies a smaller 20 pin connector to succeed the 24 pin connector.[27]Charger efficiency

The world's five largest handset makers introduced a new rating system in November 2008 to help consumers more easily identify the most energy-efficient chargersThe majority of energy lost in a mobile phone charger is in its no load condition, when the mobile phone is not connected but the charger has been left plugged in and using power. To combat this, in November 2008, the top five mobile phone manufacturers Nokia, Samsung, LG, Sony Ericsson, and Motorola set up a star rating system to rate the efficiency of their chargers in the no-load condition. Starting at zero stars for >0.5 W and going up to the top five star rating for